Pure copper is rose red metal, which is purple after the surface forms a copper oxide film. Therefore, industrial pure copper is often called copper or electrolytic copper. The density is 8-9 g/cm3 and the melting point is 1083 °C. Pure copper has good conductivity and is widely used in the manufacture of wires, cables, brushes, etc.; it has good thermal conductivity and is commonly used to manufacture magnetic instruments and instruments that require anti-magnetic interference, such as compasses, aviation instruments, etc.; plasticity is excellent, easy to heat Pressure and cold pressure processing, can be made into tubes, rods, wires, strips, strips, plates, foils and other copper.
Brass is an alloy of copper and zinc. The simplest brass is a copper-zinc binary alloy called a simple brass or plain brass tube. Brass with different mechanical properties can be obtained by changing the zinc content of the brass. The higher the content of zinc in brass, the higher the strength and the lower the plasticity. The brass used in the industry does not contain more than 45% zinc. If the zinc content is high, brittleness will occur and the properties of the alloy will deteriorate.
Tin bronze is the earliest alloy used in history. It originally refers to copper-tin alloy. Because the color is blue-gray, it is called bronze. Tin bronze has high mechanical properties, good corrosion resistance, friction reduction and good casting properties; low sensitivity to overheating and gas, good welding performance, no ferromagnetism, and low shrinkage coefficient. Tin bronze is more resistant to corrosion in the atmosphere, sea water, fresh water and steam than brass.